Avaliação ultrassonográfica do coração fetal pela técnica tridimensional XI VOCAL

• Ano de defesa: 2011
• Autor(a) principal: Barreto, Enoch Quinderé de Sá [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Ultrassonografia tridimensional; Volumetria ultrassonográfica tridimensional; Coração fetal
• Link de acesso: http://repositorio.unifesp.br/handle/11600/9134

Objectives: Validating an in vitro method for XI VOCALTM (eXtended Imaging Virtual Organ Computer-Aided anaLysys) three-dimensional ultrasound study; establishing intervals of reference to evaluate fetal heart volume between 20 and 34 gestational weeks; assessing the intraobserver and interobserver reproducibility for this method. Methods: In order to validate an in vitro method, three plastic models filled with ultrasound gel were constructed. These models were measured by two different observers using three different scan methods: XI VOCALTM, VOCALTM and Multiplanar. In order to achieve a reference curve with normal values of fetal heart volume, a cross-sectional study including 303 pregnant women between 20 and 34 gestational weeks was evaluated. The assessment was performed using a 10 plane section for each case. Results: All methods had high reliability and were considered useful for in vitro studies. There was no difference between the methods, although the evaluation using XI VOCALTM closer to the real volume of the models (mean difference 0,18 cm ³). The fetal heart evaluation allowed the construction of a polynomial regression model, with increasing of variability according to gestational age progression. The intervals of reference were calculated according to the percentiles 5, 10, 25, 50, 75, 90 and 95. There was no difference regarding the results achieved intra or inter observers (p = 0.041 and p = 0.175, respectively). The reproducibility of the method was considered good (ICC> 0.90). Conclusions: The XI VOCALTM method can be used for in vitro evaluation, with good accuracy, mainly with 10 planes section. This method has good reproducibility in clinical practice. The fetal heart volume has a rising curve between 20 and 34 gestational weeks.